linux-kernel - [patch 13/45] posix-cpu-timers: Replace old expiry retrieval in posix_cpu_timer

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Date:   Tue,  6 Jun 2023 16:37:39 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        John Stultz <jstultz@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Oleg Nesterov <oleg@...hat.com>
Subject: [patch 13/45] posix-cpu-timers: Replace old expiry retrieval in
 posix_cpu_timer_set()

Reuse the split out __posix_cpu_timer_get() function which does already the
right thing.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/posix-cpu-timers.c |   28 +++++-----------------------
 1 file changed, 5 insertions(+), 23 deletions(-)

--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -609,6 +609,8 @@ static void cpu_timer_fire(struct k_itim
 	}
 }
 
+static void __posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec64 *itp, u64 now);
+
 /*
  * Guts of sys_timer_settime for CPU timers.
  * This is called with the timer locked and interrupts disabled.
@@ -680,29 +682,9 @@ static int posix_cpu_timer_set(struct k_
 	else
 		now = cpu_clock_sample_group(clkid, p, !sigev_none);
 
-	if (old) {
-		if (old_expires == 0) {
-			old->it_value.tv_sec = 0;
-			old->it_value.tv_nsec = 0;
-		} else {
-			/*
-			 * Update the timer in case it has overrun already.
-			 * If it has, we'll report it as having overrun and
-			 * with the next reloaded timer already ticking,
-			 * though we are swallowing that pending
-			 * notification here to install the new setting.
-			 */
-			u64 exp = bump_cpu_timer(timer, now);
-
-			if (now < exp) {
-				old_expires = exp - now;
-				old->it_value = ns_to_timespec64(old_expires);
-			} else {
-				old->it_value.tv_nsec = 1;
-				old->it_value.tv_sec = 0;
-			}
-		}
-	}
+	/* Retrieve the previous expiry value if requested. */
+	if (old && old_expires)
+		__posix_cpu_timer_get(timer, old, now);
 
 	/* Retry if the timer expiry is running concurrently */
 	if (unlikely(ret)) {